<?php
/**
 * Zend Framework
 *
 * LICENSE
 *
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://framework.zend.com/license/new-bsd
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@zend.com so we can send you a copy immediately.
 *
 * @category   Zend
 * @package    Zend_Json
 * @copyright  Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 * @version    $Id: Http.php 18951 2009-11-12 16:26:19Z alexander $
 */

/**
 * @see Zend_Json_Server_Response
 */
require_once 'Zend/Json/Server/Response.php';

/**
 * @category   Zend
 * @package    Zend_Json
 * @copyright  Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */
class Zend_Json_Server_Response_Http extends Zend_Json_Server_Response
{
	/**
	 * Emit JSON
	 *
	 * Send appropriate HTTP headers. If no Id, then return an empty string.
	 *
	 * @return string
	 */
	public function toJson()
	{
		$this->sendHeaders();
		if (!$this->isError() && null === $this->getId()) {
			return '';
		}

		return parent::toJson();
	}

	/**
	 * Send headers
	 *
	 * If headers are already sent, do nothing. If null ID, send HTTP 204
	 * header. Otherwise, send content type header based on content type of
	 * service map.
	 *
	 * @return void
	 */
	public function sendHeaders()
	{
		if (headers_sent()) {
			return;
		}

		if (!$this->isError() && (null === $this->getId())) {
			header('HTTP/1.1 204 No Content');
			return;
		}

		if (null === ($smd = $this->getServiceMap())) {
			return;
		}

		$contentType = $smd->getContentType();
		if (!empty($contentType)) {
			header('Content-Type: ' . $contentType);
		}
	}
}
